I bought the app, and am enjoying it a lot so far.
There is a lot of other apps that do the same thing (app side bar) with a lot more functions, but this one is the best looking one for me.
Here's some suggestions, according to what would be my "dream sidebar" :
Being able to change side (I'm left handed)
Being able to add all my apps at once (swapps does this I think)
Possibility to see the recently opened apps in the sidebar (swapps does this)
Having the name of the app above my thumb instead of hidden under it
Home button on top
Being able to change the icons
And some themes options, color changing, "use image.jpg as sidebar" and stuffs like that.
There you go, hoping to see some of those in the app